Investments (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Investment balances
Cost	$ 57,587	$ 64,293
Gross Unrealized Gains	197	315
Gross Unrealized Losses	(12)	(54)
Estimated Market Value	57,772	64,554
U.S. Government and Government Agency Obligations
Investment balances
Cost	50,905	42,595
Gross Unrealized Gains	11	16
Estimated Market Value	50,916	42,611
Fixed Income Funds
Investment balances
Cost	3,058	10,984
Gross Unrealized Gains	26	99
Estimated Market Value	3,084	11,083
Money Market Funds
Investment balances
Cost	1,219	8,584
Estimated Market Value	1,219	8,584
Equity Funds
Investment balances
Cost	2,405	2,130
Gross Unrealized Gains	160	200
Gross Unrealized Losses	(12)	(54)
Estimated Market Value	$ 2,553	$ 2,276